Sync source readiness endpoint

src/index.ts

@@ -18,6 +18,37 @@ app.get("/health", async (_req, res) => {
   }
 });
 
+app.get("/ready", async (_req, res) => {
+  try {
+    const result = await pool.query(
+      `SELECT s.id, s.name, s.last_synced_at, s.last_error,
+              COUNT(sig.id)::int AS signal_count
+       FROM sources s
+       LEFT JOIN signals sig ON sig.source_id=s.id
+       GROUP BY s.id,s.name,s.last_synced_at,s.last_error
+       ORDER BY s.id`
+    );
+    const missing = result.rows
+      .filter((row: any) => Number(row.signal_count) < 1)
+      .map((row: any) => row.id);
+    const errored = result.rows
+      .filter((row: any) => row.last_error)
+      .map((row: any) => row.id);
+
+    if (missing.length || errored.length) {
+      return res.status(503).json({
+        ok: false,
+        missing_sources: missing,
+        errored_sources: errored,
+        sources: result.rows
+      });
+    }
+    return res.json({ ok: true, sources: result.rows });
+  } catch (error) {
+    return res.status(503).json({ ok: false, error: error instanceof Error ? error.message : String(error) });
+  }
+});
+
 app.get("/.well-known/oauth-protected-resource", (req, res) => res.json(protectedResourceMetadata(req)));
 app.get("/.well-known/oauth-protected-resource/api/mcp", (req, res) => res.json(protectedResourceMetadata(req)));